The first choice is correct
Panic would give you extreme fear to the point where you're frozen.
The correct answer is A: the consent of the people.
Jefferson makes it very clear that the source of a government's authority is the consent of the people. He uses the phrase "consent of the governed," which means the people (since they are the ones who are governed).
He does not believe a government's authority comes from tradition, the military, or a leader.